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https://www.readbyqxmd.com/read/28636402/a-chiral-pentenolide-based-unified-strategy-toward-dihydrocorynantheal-dihydrocorynantheol-protoemetine-protoemetinol-and-yohimbane
#1
Changmin Xie, Jisheng Luo, Yan Zhang, Lili Zhu, Ran Hong
An organocatalytic cross-aldol reaction of formaldehyde (formalin) with alkyl aldehydes, followed by the Z-selective Horner-Wadsworth-Emmons (HWE) reaction and immediate lactonization, afforded γ-alkylated pentenolides in good overall yields and excellent enantioselectivities. Based on this scalable sequence, five quinolizidine alkaloids were synthesized in a unified and concise manner. The development of an in situ activation of a tertiary amide to improve the efficiency of the Bischler-Napieraiski (B-N) reaction was also noteworthy due to the generality to sensitive substrates for a variety of target molecules...
June 21, 2017: Organic Letters
https://www.readbyqxmd.com/read/28624468/fish-mass-immunization-against-virus-with-recombinant-spiny-bacterins
#2
Julio Coll
Bacterins obtained from recombinant bacteria displaying heterologous antigens in its surface coded by prokaryotic rather than eukaryotic expression plasmids (here called "spiny" bacterins or spinycterins), have been used to increase fish immunogenicity of recombinant viral protein fragments. To explore their immunogenicity, five bacterial-specific membrane anchor-motifs characterized in the literature (Nmistic, Mistic, NTD, YAIN and YBEL) were genetically fused to the immunorelevant cystein-free 117 amino acid fragment II from the ORF149 of cyprinid herpes virus 3 (frgIICyHV3)...
June 15, 2017: Fish & Shellfish Immunology
https://www.readbyqxmd.com/read/28621921/a-novel-polymer-aerogel-towards-high-dimensional-stability-mechanical-property-and-fire-safety
#3
Ke Shang, Jun-Chi Yang, Zhijie Cao, Wang Liao, Yu-Zhong Wang, David A Schiraldi
Inorganic silica-based aerogels, earliest and widely-used aerogels, have poorer mechanical properties than their organic substitutes, which are flammable. In this study, a novel polymeric aerogel with high strength, inherent flame retardancy and cost-effectiveness, which is based on poly(vinyl alcohol) (PVA) crosslinked with melamine-formaldehyde (MF), was prepared under aqueous condition with an eco-friendly freeze-drying and post-curing process. Combined with the additional rigid MF network and benifited from the resulting unique infrastructure of inter-crosslinked flexible PVA segments and rigid MF segments, PVA-based aerogels exibited a significantly decreased degradation rate, and sharply decreased peak heat release rate (PHRR) in cone calorimeter tests (by as much as 83%) compared with neat PVA...
June 16, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28621308/inhalation-toxicity-of-indoor-air-pollutants-in-drosophila-melanogaster-using-integrated-transcriptomics-and-computational-behavior-analyses
#4
Hyun-Jeong Eom, Yuedan Liu, Gyu-Suk Kwak, Muyoung Heo, Kyung Seuk Song, Yun Doo Chung, Tae-Soo Chon, Jinhee Choi
We conducted an inhalation toxicity test on the alternative animal model, Drosophila melanogaster, to investigate potential hazards of indoor air pollution. The inhalation toxicity of toluene and formaldehyde was investigated using comprehensive transcriptomics and computational behavior analyses. The ingenuity pathway analysis (IPA) based on microarray data suggests the involvement of pathways related to immune response, stress response, and metabolism in formaldehyde and toluene exposure based on hub molecules...
June 16, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28620626/tobacco-smoke-constituents-trigger-cytoplasmic-calcium-release
#5
M Flori Sassano, Arunava Ghosh, Robert Tarran
Cytosolic Ca(2+) is a universal second messenger that is involved in many processes throughout the body, including the regulation of cell growth/cell division, apoptosis, and the secretion of both ions, and macromolecules. Tobacco smoke exerts multiple effects on airway epithelia and we have previously shown that Kentucky reference cigarette smoke exposure elevated the second messenger Ca(2+), leading to dysfunctional ion secretion. In this study, we tested whether little cigar and commercial cigarette smoke exposure exerts similar effects on intracellular Ca(2+) levels...
June 1, 2017: Applied in Vitro Toxicology
https://www.readbyqxmd.com/read/28618778/tunable-large-pore-mesoporous-carbons-for-the-enhanced-adsorption-of-humic-acid
#6
Wannes Libbrecht, A Verberckmoes, Joris W Thybaut, Pascal Van Der Voort, Jeriffa De Clercq
Tunable large pore soft templated mesoporous carbons (SMC) were obtained via the organic self-assembly of resorcinol/formaldehyde with the triblock copolymer F127 and by studying the effect of carbon precursor to surfactant (p/s) ratio and carbonization temperature on the material characteristics. The p/s ratio and carbonization temperature were varied respectively from 0.83 to 0.25 and from 400 °C to 1200 °C. The resulting SMCs had various average pore sizes, tunable from 7 up to 50 nm. At lower p/s ratios, the pore size increased, pore size distributions broadened and pore volumes increased...
June 15, 2017: Langmuir: the ACS Journal of Surfaces and Colloids
https://www.readbyqxmd.com/read/28617668/flexible-room-temperature-formaldehyde-sensors-based-on-rgo-film-and-rgo-mos2-hybrid-film
#7
Xian Li, Jiang Wang, Dan Xie, Jianlong Xu, Yi Xia, Weiwei Li, Lan Xiang, Zhemin Li, Shiwei Xu, Sridhar Komarneni
Gas sensors based on reduced graphene oxide (rGO) films and rGO/MoS2 hybrid films were fabricated on polyethylene naphthalate (PEN) substrates by a simple self-assembly method, which yielded flexible devices for detection of formaldehyde (HCHO) at room temperature. The sensing test results indicated that the rGO and rGO/MoS2 sensors were highly sensitive and fully recoverable to ppm-level of HCHO. The bending and fatigue test results revealed that the sensors were also mechanically robust, durable and effective for long-term...
June 15, 2017: Nanotechnology
https://www.readbyqxmd.com/read/28615087/association-between-intestinal-helminth-infections-and-mid-upper-arm-circumference-among-children-in-sri-lanka-a-cross-sectional-study
#8
L S Galgamuwa, D Iddawela, S D Dharmaratne
Intestinal helminth infections constitute a major health problem in low socio-economic communities worldwide. A cross-sectional study was conducted in children aged between 12 and 60 months. A structured questionnaire was used to collect socio-demographic data and stool samples were subjected to direct smear, stained with Lugol's iodine, and formaldehyde-ether concentration techniques to determine the prevalence of intestinal helminth infections. The circumference of each child's left mid upper arm (MUAC) was measured using standard procedures...
June 15, 2017: Journal of Helminthology
https://www.readbyqxmd.com/read/28614628/temperature-dependence-of-the-rates-of-reaction-of-trifluoracetic-acid-with-criegee-intermediates
#9
Rabi Chhantyal-Pun, Max McGillen, Joseph Beames, Anwar Khan, Carl Percival, Dudley Shallcross, Andrew Orr-Ewing
The rate coefficients for gas-phase reactions of trifluoroacetic acid (TFA) with two Criegee intermediates, formaldehyde oxide and acetone oxide, decrease with increasing temperature in the range 240 - 340 K. The rate coefficients k(CH2OO + TFA) = (3.4 ± 0.3) × 10-10 cm3 s-1 and k((CH3)2COO + TFA) = (6.1 ± 0.2) × 10-10 cm3 s-1 at 294 K exceed estimates for collision-limited values, suggesting rate enhancement by capture mechanisms because of the large permanent dipole moments of the two reactants. The observed temperature dependence is attributed to competitive stabilization of a pre-reactive complex...
June 14, 2017: Angewandte Chemie
https://www.readbyqxmd.com/read/28614110/contact-sensitization-due-to-allergens-in-nail-cosmetics-identification-treatment-and-prevention
#10
Margaret Chou, Nikhil Dhingra, Tamara Lazic Strugar
Ingredients found in the nail cosmetic industry, including but not limited to methacrylate and acrylate monomers, formaldehyde, and toluene sulfonamide-formaldehyde resin, can incite allergic contact dermatitis. An eczematous outbreak presents on areas surrounding the nail plate and may spread through contact transfer of the allergen, commonly to the face and neck. Even components that were originally deemed nonsensitizing, such as the ubiquitous cyanoacrylate adhesive family, have been found to be allergenic...
June 13, 2017: Dermatitis
https://www.readbyqxmd.com/read/28613818/efficient-removal-of-anionic-radioactive-pollutant-from-water-using-ordered-urea-functionalized-mesoporous-polymeric-nanoparticle
#11
Jian Shen, Wei Chai, Kaixuan Wang, Fang Zhang
A urea-functionalized ordered mesoporous polymeric nanoparticle for removing the perrhenate anion ReO4- as the surrogate of the particularly intractable anion radioactive pollutant TcO4- was demonstrated in the present study. This nanomaterial (denoted as urea-MPN) was produced for the first time by a surfactant-directed urea-phenol-formaldehyde resol oligomers self-assembly protocol under hydrothermal condition. The obtained urea-MPN possessed the uniform nanosized spherical morphology with 3D interconnected ordered cubic mesoporous structure...
June 14, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28613235/nanocrystalline-tio%C3%A2-composite-films-for-the-photodegradation-of-formaldehyde-and-oxytetracycline-under-visible-light-irradiation
#12
Min Wei, Xue-Lei Peng, Qi-Sheng Liu, Fang Li, Ming-Ming Yao
In order to effectively photodegradate organic pollutants, ZnO composite and Co-B codoped TiO₂ films were successfully deposited on glass substrates via a modified sol-gel method and a controllable dip-coating technique. Combining with UV-Vis diffuse reflectance spectroscopy (DRS) and photoluminescence spectra (PL) analyses, the multi-modification could not only extend the optical response of TiO₂ to visible light region but also decrease the recombination rate of electron-hole pairs. XRD results revealed that the multi-modified TiO₂ film had an anatase-brookite biphase heterostructure...
June 14, 2017: Molecules: a Journal of Synthetic Chemistry and Natural Product Chemistry
https://www.readbyqxmd.com/read/28609738/adsorption-of-dyes-on-the-surface-of-polymer-nanocomposites-modified-with-methylamine-and-copper-ii-chloride
#13
Magdalena Ptaszkowska-Koniarz, Joanna Goscianska, Robert Pietrzak
Polymer nanocomposite was prepared by the conventional sol-gel method using formaldehyde and resorcinol. The surface of the nanocomposite was functionalized with methylamine. Some of the samples were additionally impregnated with copper(II) chloride. All the materials obtained were characterized by FT-IR spectroscopy, low-temperature nitrogen sorption, thermal and elemental analysis. The samples modified with amine groups had lower surface areas and smaller pore volumes than the pure nanocomposite. The modification with methylamine and copper(II) chloride led to increased content of both acidic and basic oxygen functional groups...
June 10, 2017: Journal of Colloid and Interface Science
https://www.readbyqxmd.com/read/28606328/influence-of-physical-and-chemical-factors-on-the-embryonation-hatching-and-infectivity-of-spirocerca-lupi
#14
Alicia Rojas, Niva Freedberg, Alex Markovics, Yuval Gottlieb, Gad Baneth
Spirocerca lupi is a parasitic nematode which causes spirocercosis, a severe disease of dogs. Its life cycle involves dung beetles as intermediate hosts and canids as definitive hosts. The effect of different physical conditions and chemical factors on the embryonation and hatching of S. lupi eggs were investigated in this study in order to understand the triggers for progression in the early development of this parasite. Exposure to potassium dichromate significantly enhanced the embryonation of eggs compared to formaldehyde and controls (p<0...
August 15, 2017: Veterinary Parasitology
https://www.readbyqxmd.com/read/28605389/genome-wide-mapping-of-protein-dna-interactions-with-chec-seq-in-saccharomyces-cerevisiae
#15
Sebastian Grünberg, Gabriel E Zentner
Genome-wide mapping of protein-DNA interactions is critical for understanding gene regulation, chromatin remodeling, and other chromatin-resident processes. Formaldehyde crosslinking followed by chromatin immunoprecipitation and high-throughput sequencing (X-ChIP-seq) has been used to gain many valuable insights into genome biology. However, X-ChIP-seq has notable limitations linked to crosslinking and sonication. Native ChIP avoids these drawbacks by omitting crosslinking, but often results in poor recovery of chromatin-bound proteins...
June 3, 2017: Journal of Visualized Experiments: JoVE
https://www.readbyqxmd.com/read/28605048/synthesis-and-antiproliferative-activity-of-thioxoflavones-mannich-base-derivatives
#16
Wei Li, Xueli Li, Manhui Liu, Qiuan Wang
Two series of 12 novel thioxoflavones Mannich base derivatives 5a-f and 6a-f were synthesized via Mannich reaction of 4',7-dimethoxy-5-hydroxyflavothione (3) or 3',4',7-trimethoxy-5-hydroxyflavothione (4) with appropriate aliphatic amines or alicyclic amines and formaldehyde. Thioxoflavones 3 and 4 were prepared from 4',7-dimethoxy-5-hydroxyflavone (1) and 3',4',7-trimethoxy-5-hydroxyflavone (2) with Lawesson's reagent, respectively. Their antiproliferative activities in vitro were evaluated on a panel of three human cell lines (HeLa, HCC1954, and SK-OV-3) by CCK-8 assay...
June 12, 2017: Archiv der Pharmazie
https://www.readbyqxmd.com/read/28604897/products-of-criegee-intermediate-reactions-with-no2-experimental-measurements-and-tropospheric-implications
#17
Rebecca L Caravan, M Anwar H Khan, Brandon Rotavera, Ewa Papajak, Ivan O Antonov, Ming-Wei Chen, Kendrew Au, Wen Chao, David L Osborn, Jim Jr-Min Lin, Carl J Percival, Dudley E Shallcross, Craig A Taatjes
The reactions of Criegee intermediates with NO2 have been proposed as a potentially significant source of the important nighttime oxidant NO3, particularly in urban environments where concentrations of ozone, alkenes and NOx are high. However, previous efforts to characterize the yield of NO3 from these reactions have been inconclusive, with many studies failing to detect NO3. In the present work, the reactions of formaldehyde oxide (CH2OO) and acetaldehyde oxide (CH3CHOO) with NO2 are revisited to further explore the product formation over a pressure range of 4-40 Torr...
June 12, 2017: Faraday Discussions
https://www.readbyqxmd.com/read/28602281/on-line-gaseous-formaldehyde-detection-by-a-microfluidic-analytical-method-based-on-simultaneous-uptake-and-derivatization-in-a-temperature-controlled-annular-flow
#18
Maud Guglielmino, Pierre Bernhardt, Claire Trocquet, Christophe A Serra, Stéphane Le Calvé
This paper is focused on the improvement of a microfluidic analytical method for the detection of low airborne formaldehyde concentrations, based on only two distinct steps permitting to reduce the response time and to improve the compactness of the device. First, gaseous formaldehyde is trapped into an acetylacetone solution at 65°C through an annular liquid/gas flow and reacts immediately to form 3,5-Diacetyl-1,4-dihydrolutidine which is then quantified by colorimetry using a liquid core waveguide (LCW)...
September 1, 2017: Talanta
https://www.readbyqxmd.com/read/28595418/what-is-special-about-how-roaming-chemical-reactions-traverse-their-potential-surfaces-differences-in-geodesic-paths-between-roaming-and-non-roaming-events
#19
D Vale Cofer-Shabica, Richard M Stratt
With the notable exception of some illustrative two-degree-of-freedom models whose surprising classical dynamics has been worked out in detail, theories of roaming have largely bypassed the issue of when and why the counterintuitive phenomenon of roaming occurs. We propose that a useful way to begin to address these issues is to look for the geodesic (most efficient) pathways through the potential surfaces of candidate systems. Although roaming manifests itself in an unusual behavior at asymptotic geometries, we found in the case of formaldehyde dissociation that it was the pathways traversing the parts of the potential surface corresponding to highly vibrationally excited reactants that were the most revealing...
June 7, 2017: Journal of Chemical Physics
https://www.readbyqxmd.com/read/28595155/multielectron-dissociative-ionization-of-methane-and-formaldehyde-molecules-with-optimally-tailored-intense-femtosecond-laser-pulses
#20
E Irani, A Anvari, R Sadighi-Bonabi, M Monfared
The multielectron dissociative ionization of CH4 and CH2O molecules has been investigated using optimum convolution of different dual tailored short laser pulses. Based on three dimensional molecular dynamics simulations and TDDFT approach, the dissociation probability is enhanced by designing the dual chirped-chirped laser pulses and chirped-ordinary laser pulses for formaldehyde molecule. However, it is interesting to notice that the sensitivity of enhanced dissociation probability into different tailored laser pulses is not significant for methane molecule...
May 31, 2017: Spectrochimica Acta. Part A, Molecular and Biomolecular Spectroscopy
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